/*
 Copyright 2019 Alain Dargelas
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

/* 
 * File:   ExprBuilder.cpp
 * Author: alain
 * 
 * Created on November 2, 2017, 9:45 PM
 */
#include "../ErrorReporting/ErrorContainer.h"
#include "ExprBuilder.h"
#include "../SourceCompile/VObjectTypes.h"
#include <iostream>
#include <sstream>

using namespace SURELOG;

ExprBuilder::ExprBuilder () 
{ 
  m_symbols = NULL;
  m_errors = NULL;
}

ExprBuilder::ExprBuilder (const ExprBuilder& orig) { }

ExprBuilder::~ExprBuilder () { }

Value* ExprBuilder::clone(Value* val) 
{
  Value* clone = NULL;
  bool isLValue = val->isLValue();
  if (val->getType() == Value::String)
    {
      clone = m_valueFactory.newValue (*(StValue*)val);
    }
  else if (isLValue)
    {
      clone = m_valueFactory.newValue (*(LValue*)val);
    }
  else 
    {
      clone = m_valueFactory.newValue (*(SValue*)val);
    }
  return clone;
}


Value* ExprBuilder::evalExpr(FileContent* fC, NodeId parent, ValuedComponentI* instance) {
  Value* value = m_valueFactory.newLValue ();    
  NodeId child = fC->Child (parent);
  if (child)
    {
      VObjectType childType = fC->Type (child);
      switch (childType)
        { 
        case VObjectType::slUnary_Minus:
          {
            NodeId sibling = fC->Sibling (child);
            Value* tmp = evalExpr (fC, sibling, instance);
            value->u_minus(tmp);
            m_valueFactory.deleteValue (tmp);
            break;
          }
        case VObjectType::slUnary_Plus:
          {
            NodeId sibling = fC->Sibling (child);
            Value* tmp = evalExpr (fC, sibling, instance);
            value->u_plus(tmp);
            m_valueFactory.deleteValue (tmp);
            break;
          }
        case VObjectType::slUnary_Not:
          {
            NodeId sibling = fC->Sibling (child);
            Value* tmp = evalExpr (fC, sibling, instance);
            value->u_not(tmp);
            m_valueFactory.deleteValue (tmp);
            break;
          }
        case VObjectType::slUnary_Tilda:
          {
            NodeId sibling = fC->Sibling (child);
            Value* tmp = evalExpr (fC, sibling, instance);
            value->u_tilda (tmp);
            m_valueFactory.deleteValue (tmp);
            break;
          }
        case VObjectType::slConstant_primary:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break;
        case VObjectType::slPrimary_literal:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break; 
        case VObjectType::slPrimary:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break; 
        case VObjectType::slExpression:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break;   
        case VObjectType::slConstant_mintypmax_expression:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break;  
        case VObjectType::slMintypmax_expression:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break;
        case VObjectType::slParam_expression:
          m_valueFactory.deleteValue (value);
          value = evalExpr (fC, child, instance);
          break;  
        case VObjectType::slConstant_expression:
          {
            Value* valueL = evalExpr (fC, child, instance);
            NodeId op = fC->Sibling (child);
            if (!op)
              {
                m_valueFactory.deleteValue (value);
                value = valueL;
                break;
              }
            VObjectType opType = fC->Type (op);
            switch (opType)
              {
              case VObjectType::slBinOp_Plus:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->plus(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Minus:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->minus(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Mult:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->mult(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Div:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->div(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Great:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->greater(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_GreatEqual:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->greater_equal(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Less:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->lesser(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_LessEqual:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->lesser_equal(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Equiv:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->equiv(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Not:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->notEqual(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_Percent:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->mod (valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_LogicAnd:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->logAnd(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_LogicOr:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->logOr(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_BitwAnd:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->bitwAnd(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_BitwOr:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value ->bitwOr(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_BitwXor:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->bitwXor(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_ShiftLeft:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->shiftLeft(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              case VObjectType::slBinOp_ShiftRight:
              {
                NodeId rval = fC->Sibling (op);
                Value* valueR = evalExpr (fC, rval, instance);
                value->shiftRight(valueL,valueR);
                m_valueFactory.deleteValue (valueL);
                m_valueFactory.deleteValue (valueR);
                break;
              }
              default:
                m_valueFactory.deleteValue (value);
                value = valueL;
                break;
              }
          }
          break;
        case VObjectType::slIntConst:
          {
            std::string val = fC->SymName (child);
            if (strstr(val.c_str(),"'"))
              {
                unsigned long hex_value = 0;
                char base = 'h';
                unsigned int i = 0;
                for (i = 0 ; i < val.size (); i++)
                  {
                    if (val[i] == '\'')
                      {
                        base = val[i+1];
                        break;
                      }
                  }
                std::string v = val.substr (i+2);
                switch (base)
                  {
                  case 'h':
                    hex_value = std::strtoul (v.c_str (), 0, 16);
                    break;
                  case 'b':
                    hex_value = std::strtoul (v.c_str (), 0, 2);
                    break; 
                  case 'o':
                    hex_value = std::strtoul (v.c_str (), 0, 8);
                    break; 
                  case 'd':
                    hex_value = std::strtoul (v.c_str (), 0, 10);  
                    break;
                  default:
                    break;
                  }
                value->set(hex_value);
              }
            else 
              {  
                value->set(atol (val.c_str()));
              }
            break;
          }
        case VObjectType::slRealConst:
          {
            std::string real = fC->SymName (child).c_str ();
            std::istringstream os(real);
            double d;
            os >> d;
            value->set(d);
            break;
          }
        case VObjectType::slNull_keyword:
          {
            value->set((unsigned long) 0);
            break;
          }
        case VObjectType::slStringConst:
          {
            std::string name = fC->SymName (child).c_str ();
            Value* sval = NULL;
            if (instance)
               sval = instance->getValue (name);
            if (sval == NULL)
              { 
                Location loc (fC->getFileId (child), fC->Line(child), 0, m_symbols->registerSymbol (name));
                Error err (ErrorDefinition::ELAB_UNDEF_VARIABLE, loc);
                m_errors->addError (err);
                value->set(NAN);
                break;
              }
            if (sval->getType () == Value::String)
              {
                m_valueFactory.deleteValue (value);
                value = sval;
              }
            else 
              {
               value->u_plus(sval);
              }
            break;
          }
        case VObjectType::slStringLiteral:
          {
            std::string name = fC->SymName (child).c_str ();
            m_valueFactory.deleteValue (value);
            value = m_valueFactory.newStValue ();
            value->set (name);
            break;
          }
        default:
          value->set(NAN);
          break;
        }
    }
  else 
    { 
      VObjectType type = fC->Type (parent);
      switch (type)
        {
         case VObjectType::slStringConst:
          {
            std::string name = fC->SymName (parent).c_str ();
            Value* sval = NULL;
            if (instance)
               sval = instance->getValue (name);
            if (sval == NULL)
              {
                Location loc (fC->getFileId (child), fC->Line(child), 0, m_symbols->registerSymbol (name));
                Error err (ErrorDefinition::ELAB_UNDEF_VARIABLE, loc);
                m_errors->addError (err);
                value->set(NAN);
                break;
              }
            NodeId op = fC->Sibling(parent);
            VObjectType op_type = fC->Type (op);
            switch (op_type)
              {
              case VObjectType::slIncDec_PlusPlus:
                value->u_plus(sval);
                value->incr();
                return value;
              case VObjectType::slIncDec_MinusMinus:
                value->u_plus(sval);
                value->decr();
                return value;
              default:
                break;
              }
            break;
         }
        default:
          break;
        }
          
      value->set(NAN);
    }    
  return value;
}